Stabilized oil and methods of making the same

ABSTRACT

Stabilized oils including an edible oil and an antioxidant composition comprising α-lipoic acid and least one of ascorbic acid, ascorbyl palmitate, green tea extract, lecithin, and rosemary extract or at least one of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodin, and methods of preparing such stabilized edible oils. The stabilized oils may have an Oxidative Stability Index (“OSI”) at 110° C. of at least 30 hours.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional PatentApplication Ser. No. 62/058,460, filed Oct. 1, 2014, entitled STABILIZEDOIL AND METHODS OF MAKING THE SAME, and U.S. Provisional PatentApplication Ser. No. 62/168,162, filed May 29, 2015, entitled STABILIZEDOIL AND METHODS OF MAKING THE SAME, which applications are herebyincorporated by reference herein in their entirety.

TECHNICAL FIELD

The present disclosure relates generally to a stabilized oil includingan edible oil and an antioxidant composition comprising α-lipoic acidand methods of making the same.

BACKGROUND

Rancidification of edible oils and fats, as well as the foods thatcontain edible oils and fats, is a significant problem in foodindustries. This is particularly the case because of the increasingemphasis on the use of polyunsaturated oils due to their perceivedhealth benefits, as the oxidative stability of a fatty acid generallydecreases noticeably as the degree of unsaturation increases.

Omega-3 fatty acids, also referred to as n-3 fatty acids, arepolyunsaturated fatty acids having a carbon-carbon double bond in thethird position from the end of the carbon chain. From a nutritionalstandpoint, the most important omega-3 fatty acids are probablyα-linolenic acid (“ALA”), eicosapentaenoic acid (“EPA”), anddocosahexaenoic acid (“DHA”). ALA is an 18-carbon fatty acid moietyhaving three carbon-carbon double bonds (commonly referred to as C18:3in shorthand notation), one of which is at the n-3 position. EPA is a20-carbon fatty acid moiety having 5 carbon-carbon double bonds(“C20:5”) and DHA is a 22-carbon fatty acid moiety having 6carbon-carbon double bonds (“C22:6”).

Unfortunately, ALA, EPA, and DHA are all polyunsaturated fats that tendto oxidize fairly readily. EPA (with 5 carbon-carbon double bonds) issignificantly more prone to oxidation than ALA; DHA (with 6carbon-carbon double bonds) is even more prone to oxidation than EPA. Asa consequence, increasing the omega-3 fatty acid content tends to reducethe shelf life of many food products. These problems become particularlyacute with oils including significant amounts of EPA and DHA.

SUMMARY

In one aspect, provided is a stabilized oil including an edible oil andan antioxidant composition, where the antioxidant composition comprisesα-lipoic acid and least one of ascorbyl palmitate, green tea extract,lecithin, ascorbic acid, and rosemary extract.

In another aspect, provided is a stabilized oil including an edible oiland an antioxidant composition, where the antioxidant compositioncomprises α-lipoic acid and least one of 1,2,4-benzenetriol, carnosicacid, dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid,3-hydroxytyrosol, myricetin, and nepodin.

In another aspect, provided are methods for preparing a stabilized oil,the method comprising providing an edible oil, and adding an antioxidantcomposition to the edible oil to provide a stabilized oil, where theantioxidant composition comprises α-lipoic acid and least one ofascorbic acid, ascorbyl palmitate, green tea extract, lecithin, androsemary extract.

In another aspect, provided are methods for preparing a stabilized oil,the method comprising providing an edible oil, and adding an antioxidantcomposition to the edible oil to provide a stabilized oil, where theantioxidant composition comprises α-lipoic acid and least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodin.

DETAILED DESCRIPTION

Stabilized edible oils and methods of stabilizing edible oils aredisclosed. As described herein, stabilized oils can be prepared byadding an antioxidant mixture to an edible oil, the antioxidant mixturecomprising α-lipoic acid and at least one of ascorbic acid, ascorbylpalmitate, green tea extract, lecithin, and rosemary extract, or theantioxidant mixture comprising α-lipoic acid and at least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodin.

Edible Oil

As used herein, the term “edible oil” means an oil suitable for humanconsumption. Edible oils are typically compositions includingtriacylglycerols (“TAG”). Edible oils useful in embodiments of thepresent application can be hydrogenated oils, chemically orenzymatically interesterified oils, fractionated oils, and blended oils.In some embodiments, the edible oil may be an identity-preserved oil ora genetically-modified oil. The process of hydrogenation of oils refersto the partial or complete saturation of the fatty acid components ofTAG. Interesterification refers to a process where fatty acids have beenrearranged on the glycerol backbone of a TAG. Fractionation refers to aprocess where one fraction of an oil is separated from another fraction.Typically, using temperature modification, an oil can be separated intolower and higher melting point fractions. Blending refers to a processwhere one or more different oils or oil fractions are mixed together.

These above-described processes can be carried out to provide an edibleoil with the desired characteristics to be used in a particularapplication (e.g., baking, frying). More than one of these processes canbe carried out to provide such an edible oil. For example, oils can beblended followed by interesterification to yield a useful edible oil.The present disclosure contemplates combinations of any of theabove-described oils can be used.

Edible oils may include, without limitation, a citrus oil (e.g., lemonoil, orange oil), a coconut oil, a corn oil, a cottonseed oil, a flaxseed oil, a grape seed oil, a marine oil (e.g., a fish oil, an algaloil, a fungal oil), a mustard oil, a nut oil (e.g., almond oil, cashewoil, walnut oil), an olive oil, a palm oil (and fractions), a peanutoil, a rapeseed oil (e.g., a canola oil), a rice bran oil, a saffloweroil, a sesame oil, a soybean oil, a sunflower oil, or mixtures thereof.

In some embodiments, the edible oil may include one or more omega-3fatty acids, such as, for example, α-linolenic acid (“ALA”),docosahexaenoic acid (“DHA”), eicosapentaenoic acid (“EPA”), andstearidonic acid (“SDA”). In some embodiments, the edible oil mayinclude at least 0.05 wt. %, at least 0.1 wt. %, at least 0.2 wt. %, atleast 0.3 wt. %, at least 0.4 wt. %, at least 0.5 wt. %, at least 0.6wt. %, at least 0.7 wt. %, at least 0.8 wt. %, at least 0.9 wt. %, atleast 1 wt. %, at least 1.5 wt. %, at least 2 wt. %, at least 2.5 wt. %,at least 3 wt. %, at least 3.5 wt. %, at least 4 wt. %, at least 4.5 wt.%, at least 5 wt. %, at least 5.5 wt. %, at least 6 wt. %, at least 6.5wt. %, at least 7 wt. %, at least 7.5 wt. %, at least 8 wt. %, at least8.5 wt. %, at least 9 wt. %, at least 9.5 wt. %, at least 10 wt. %, atleast 12 wt. %, at least 14 wt. %, at least 16 wt. %, at least 18 wt. %,at least 20 wt. %, at least 22 wt. %, at least 24 wt. %, at least 26 wt.%, or at least 28 wt. % combined EPA and DHA. In some embodiments, theedible oil may include at most 33%, at most 28%, at most 23% at most18%, at most 13%, at most 8%, at most 7%, at most 6%, at most 5%, atmost 4%, at most 3%, at most 2%, or at most 1% ALA. In some embodiments,the edible oil may include at least 1%, at least 2%, at least 3%, atleast 4%, at least 5%, at least 6%, at least 7%, at least 8%, at least9%, at least 10%, at least 12%, at least 14%, at least 16%, at least18%, or at least 20% SDA.

In some embodiments, the edible oil may be a refined oil. The term“refined oil” refers to a vegetable oil which has undergone a refiningprocess. Refining is a process in which unwanted constituents areremoved from an oil. Oils can be refined to varying degrees, and it isthe desired quality of the refined oil which determines the degree ofrefining. Additionally, depending upon the properties of the oildesired, different processing steps can be included. Processes ofrefining oils are well known in the art; an exemplary description of arefining process is provided in Perkins et al., Deep Frying: Chemistry,Nutrition, and Practical Applications, pp. 12-24, AOCS Press, 1996.

Antioxidant Compositions

Antioxidant compositions of the present disclosure include α-lipoicacid. α-Lipoic acid, shown in Scheme 1, is an organosulfur compoundhaving a chiral center. α-Lipoic acid is synthesized in most animals andplants, but only the (R)-(+) enantiomer is found in nature.

α-Lipoic acid is available commercially from Sigma-Aldrich Corp., St.Louis, Mo., USA, in its (R)-(+) enantiomeric form and as a racemicmixture. α-Lipoic acid is also available commercially from LalilabIncorporated, Durham, N.C., USA, and AnMar International Ltd.,Bridgeport, Conn., USA.

In some embodiments, the stabilized oil may comprise at least about 100ppm, at least about 150 ppm, at least about 200 ppm, at least about 250ppm, at least about 300 ppm, at least about 350 ppm, at least about 400ppm, at least about 450 ppm, at least about 500 ppm, at least about 600ppm, or at least about 800 ppm α-lipoic acid. In some embodiments, thestabilized oil may comprise less than about 2,000 ppm, less than about1,900 ppm, less than about 1,800 ppm, less than about 1,700 ppm, lessthan about 1,600 ppm, less than about 1,500 ppm, less than about 1,400ppm, less than about 1,300 ppm, less than about 1,200 ppm, less thanabout 1,100 ppm, or less than about 1,000 ppm α-lipoic acid. In someembodiments, the stabilized oil may comprise about 100 ppm to about2,000 ppm α-lipoic acid, about 250 ppm to about 1,800 ppm α-lipoic acid,about 400 ppm to about 1,600 ppm α-lipoic acid, about 600 ppm to about1,400 ppm α-lipoic acid, or about 800 ppm to about 1,200 ppm α-lipoicacid. In some embodiments, the stabilized oil may comprise about 1,000ppm α-lipoic acid. In addition to α-lipoic acid, antioxidantcompositions of the present disclosure include at least one of ascorbicacid, ascorbyl palmitate, green tea extract, lecithin, and rosemaryextract or at least one of 1,2,4-benzenetriol, carnosic acid,dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid,3-hydroxytyrosol, myricetin, and nepodin.

Ascorbic acid, a naturally occurring substance known to have antioxidantproperties, is available from Sigma-Aldrich Corp., St. Louis, Mo., USAand Alfa Aesar, Ward Hill, Mass., USA. In some embodiments, thestabilized oil may comprise at least about 500 ppm, at least about 600ppm, at least about 700 ppm, at least about 800 ppm, at least about 900ppm, or at least about 1,000 ppm ascorbic acid. In some embodiments, thestabilized oil may comprise less than about 2,500 ppm, less than about2,400 ppm, less than about 2,300 ppm, less than about 2,200 ppm, lessthan about 2,100 ppm, or less than about 2,000 ppm ascorbic acid. Insome embodiments, the stabilized oil may comprise about 500 ppm to about2,500 ppm ascorbic acid, about 600 ppm to about 2,400 ppm ascorbic acid,about 700 ppm to about 2,300 ppm ascorbic acid, about 800 ppm to about2,200 ppm ascorbic acid, about 900 ppm to about 2,100 ppm ascorbic acid,or about 1,000 ppm to about 2,000 ppm ascorbic acid. In someembodiments, the stabilized oil may comprise about 1,000 ppm ascorbicacid.

Ascorbyl palmitate is a fat-soluble form of ascorbic acid availablecommercially from Sigma-Aldrich Corp., St. Louis, Mo., USA. DulcetteTechnologies LLC, Lindenhurst, N.Y., USA, and Alfa Aesar, Ward Hill,Mass., USA. In some embodiments, the stabilized oil may comprise atleast about 500 ppm, at least about 600 ppm, at least about 700 ppm, atleast about 800 ppm, at least about 900 ppm, or at least about 1,000 ppmascorbyl palmitate. In some embodiments, the stabilized oil may compriseless than about 2,500 ppm, less than about 2,400 ppm, less than about2,300 ppm, less than about 2,200 ppm, less than about 2,100 ppm, or lessthan about 2,000 ppm ascorbyl palmitate. In some embodiments, thestabilized oil may comprise about 500 ppm to about 2,500 ppm ascorbylpalmitate, about 600 ppm to about 2,400 ppm ascorbyl palmitate, about700 ppm to about 2,300 ppm ascorbyl palmitate, about 800 ppm to about2,200 ppm ascorbyl palmitate, about 900 ppm to about 2,100 ppm ascorbylpalmitate, or about 1,000 ppm to about 2,000 ppm ascorbyl palmitate. Insome embodiments, the stabilized oil may comprise about 1,000 ppmascorbyl palmitate.

Green tea extracts are known to contain compounds having antioxidantactivity. Green tea extracts suitable for use in embodiments of thepresent disclosure are commercially available under the trade nameDANISCO GUARDIAN from E. I. du Pont de Nemours and Company, Wilmington,Del., USA. In some embodiments, the stabilized oil may comprise at leastabout 400 ppm, at least about 500 ppm, at least about 600 ppm, at leastabout 700 ppm, at least about 800 ppm, or at least about 900 ppm greentea extract. In some embodiments, the stabilized oil may comprise lessthan about 1,600 ppm, less than about 1,500 ppm, less than about 1,400ppm, less than about 1,300 ppm, less than about 1,200 ppm, or less thanabout 1,100 ppm green tea extract. In some embodiments, the stabilizedoil may comprise about 400 ppm to about 1,600 ppm green tea extract,about 500 ppm to about 1,500 ppm green tea extract, about 600 ppm toabout 1,400 ppm green tea extract, about 700 ppm to about 1,300 ppmgreen tea extract, about 800 ppm to about 1,200 ppm green tea extract,or about 900 ppm to about 1,100 ppm green tea extract. In someembodiments, the stabilized oil may comprise about 1,000 ppm green teaextract.

Lecithins are compositions found in plants and animals; they commonlyinclude, among other compounds, phosphatidylcholine,phosphatidylethanolamine, and phosphatidylinositol. Lecithins are usedindustrially for their emulsifying properties and are known tocontribute to the oxidative stability of oils and fats. Lecithins usefulin embodiments of the present disclosure may be derived from plantsources, such as, for example, sunflower, soy, and canola. Lecithinsuitable for use in embodiments of the present disclosure arecommercially available from Connoils LLC, Waukesha, Wis., USA In someembodiments, the stabilized oil may comprise at least about 400 ppm, atleast about 500 ppm, at least about 600 ppm, at least about 700 ppm, atleast about 800 ppm, or at least about 900 ppm lecithin. In someembodiments, the stabilized oil may comprise less than about 1,600 ppm,less than about 1,500 ppm, less than about 1,400 ppm, less than about1,300 ppm, less than about 1,200 ppm, or less than about 1,100 ppmlecithin. In some embodiments, the stabilized oil may comprise about 400ppm to about 1,600 ppm lecithin, about 500 ppm to about 1,500 ppmlecithin, about 600 ppm to about 1,400 ppm lecithin, about 700 ppm toabout 1,300 ppm lecithin, about 800 ppm to about 1,200 ppm lecithin, orabout 900 ppm to about 1,100 ppm lecithin. In some embodiments, thestabilized oil may comprise about 1,000 ppm lecithin.

Rosemary extracts, commonly derived from Rosmarinus officinalis, areknown in the art and contain compounds which have been shown to exertantioxidative functions. Rosemary extracts that may be useful inembodiments of the present disclosure are available commercially from:Danisco, Copenhagen, Denmark; Honsea Sunshine Biotech Co. Ltd.,Guangzhou. China; JF-Natural, Tianjin, China; Kalsec, Inc., Kalamazoo,Mich., USA; Kemin Industries, Inc., Des Moines, Iowa, USA; and fromNaturex SA, Avignon, France, under the trade names STABILENHANCE OSR20,STABILENHANCE OSR4, and OXY'BLOCK D. In some embodiments, the stabilizedoil may comprise at least about 725 ppm, at least about 750 ppm, atleast about 775 ppm, at least about 800 ppm, at least about 825 ppm, atleast about 850 ppm, at least about 875 ppm, at least about 900 ppmrosemary extracts, at least about 1,000 ppm, at least about 1,500 ppm,or at least about 2,000 ppm rosemary extracts. In some embodiments, thestabilized oil may comprise less than about 6,000 ppm, less than about5,000 ppm, 4,000 ppm, less than about 3,000 ppm, less than about 2,000ppm, less than about 1,750 ppm, less than about 1,725 ppm, less thanabout 1,700 ppm, or less than about 1,675 ppm rosemary extracts. In someembodiments, the stabilized oil may comprise about 725 ppm to about6,000 ppm rosemary extracts, about 750 ppm to about 5,000 ppm rosemaryextracts, about 775 ppm to about 4,000 ppm rosemary extracts, about 800ppm to about 3,000 ppm rosemary extracts, about 825 ppm to about 2,000ppm rosemary extracts, about 850 ppm to about 1,750 ppm rosemaryextracts, about 875 ppm to about 1,725 ppm rosemary extracts, or about900 ppm to about 1,700 ppm rosemary extracts. In some embodiments, thestabilized oil may comprise about 3,000 ppm rosemary extracts.

1,2,4-benzenetriol (“HHQ”) is an aromatic polyol that occurs in natureas a biodegradation product of catechin. HHQ is commercially availablefrom Sigma-Aldrich Corp., St. Louis, Mo., USA. In some embodiments, thestabilized oil may comprise at least about 200 ppm, at least about 250ppm, at least about 300 ppm, at least about 350 ppm, at least about 400ppm, at least about 450 ppm, or at least about 500 ppm HHQ. In someembodiments, the stabilized oil may comprise less than about 1,000 ppm,less than about 950 ppm, less than about 900 ppm, less than about 850ppm, less than about 800 ppm, less than about 750 ppm, or less thanabout 700 ppm HHQ. In some embodiments, the stabilized oil may compriseabout 200 ppm to about 1,000 ppm HHQ, about 250 ppm to about 950 ppmHHQ, about 300 ppm to about 900 ppm HHQ, about 350 ppm to about 850 ppmHHQ, or about 400 ppm to about 800 ppm HHQ. In some embodiments, thestabilized oil may comprise about 200 ppm HHQ.

Carnosic acid, an antioxidant constituent of rosemary extract, iscommercially available from ChromaDex, Inc., Irvine, Calif., USA. Insome embodiments, the stabilized oil may comprise at least about 200ppm, at least about 250 ppm, at least about 300 ppm, at least about 350ppm, at least about 400 ppm, at least about 450 ppm, or at least about500 ppm carnosic acid. In some embodiments, the stabilized oil maycomprise less than about 1,000 ppm, less than about 950 ppm, less thanabout 900 ppm, less than about 850 ppm, less than about 800 ppm, lessthan about 750 ppm, or less than about 700 ppm carnosic acid. In someembodiments, the stabilized oil may comprise about 200 ppm to about1,000 ppm carnosic acid, about 250 ppm to about 950 ppm carnosic acid,about 300 ppm to about 900 ppm carnosic acid, about 350 ppm to about 850ppm carnosic acid, or about 400 ppm to about 800 ppm carnosic acid. Insome embodiments, the stabilized oil may comprise about 1,000 ppmcarnosic acid.

Dihydromyricetin (“DHM”), also known as ampelopsin, is a flavonoid thatmay be found in climbing shrubs belonging to the genus Ampelopsis. DHMis available commercially from Sigma-Aldrich Corp., St. Louis, Mo., USA.In some embodiments, the stabilized oil may comprise at least about 200ppm, at least about 250 ppm, at least about 300 ppm, at least about 350ppm, at least about 400 ppm, at least about 450 ppm, or at least about500 ppm DHM. In some embodiments, the stabilized oil may comprise lessthan about 1,000 ppm, less than about 950 ppm, less than about 900 ppm,less than about 850 ppm, less than about 800 ppm, less than about 750ppm, or less than about 700 ppm DHM. In some embodiments, the stabilizedoil may comprise about 200 ppm to about 1,000 ppm nepodin, about 250 ppmto about 950 ppm DHM, about 300 ppm to about 900 ppm DHM, about 350 ppmto about 850 ppm DHM, or about 400 ppm to about 800 ppm DHM. In someembodiments, the stabilized oil may comprise about 200 ppm to about 500ppm DHM.

Dihydrorobinetin (“DHR”) is a flavonoid that may be found in acacia(Robinia pseudoacacia) wood. DHR is available commercially from IndofineChemical Co., Inc., Hillsborough Township, N.J. USA). In someembodiments, the stabilized oil may comprise at least about 200 ppm, atleast about 250 ppm, at least about 300 ppm, at least about 350 ppm, atleast about 400 ppm, at least about 450 ppm, or at least about 500 ppmDHR. In some embodiments, the stabilized oil may comprise less thanabout 1,000 ppm, less than about 950 ppm, less than about 900 ppm, lessthan about 850 ppm, less than about 800 ppm, less than about 750 ppm, orless than about 700 ppm DHR. In some embodiments, the stabilized oil maycomprise about 200 ppm to about 1,000 ppm EGC, about 250 ppm to about950 ppm DHR, about 300 ppm to about 900 ppm DHR, about 350 ppm to about850 ppm DHR, or about 400 ppm to about 800 ppm DHR. In some embodiments,the stabilized oil may comprise about 500 ppm to about 1,000 ppm DHR.

Epigallocatechin (“EGC”) is a polyphenol antioxidant found naturally ingreen tea. EGC is available commercially from Indofine Chemical Co.,Inc., Hillsborough Township, N.J., USA. In some embodiments, thestabilized oil may comprise at least about 200 ppm, at least about 250ppm, at least about 300 ppm, at least about 350 ppm, at least about 400ppm, at least about 450 ppm, or at least about 500 ppm EGC. In someembodiments, the stabilized oil may comprise less than about 1,000 ppm,less than about 950 ppm, less than about 900 ppm, less than about 850ppm, less than about 800 ppm, less than about 750 ppm, or less thanabout 700 ppm EGC. In some embodiments, the stabilized oil may compriseabout 200 ppm to about 1,000 ppm EGC, about 250 ppm to about 950 ppmEGC, about 300 ppm to about 900 ppm EGC, about 350 ppm to about 850 ppmEGC, or about 400 ppm to about 800 ppm EGC. In some embodiments, thestabilized oil may comprise about 200 ppm to about 500 ppm EGC.

Gallic acid is a phenolic acid found in many plants (e.g., sumac, witchhazel, tea leaves), and is available commercially from Sigma-AldrichCorp., St. Louis, Mo., USA. In some embodiments, the stabilized oil maycomprise at least about 200 ppm, at least about 250 ppm, at least about300 ppm, at least about 350 ppm, at least about 400 ppm, at least about450 ppm, or at least about 500 ppm gallic acid. In some embodiments, thestabilized oil may comprise less than about 1,000 ppm, less than about950 ppm, less than about 900 ppm, less than about 850 ppm, less thanabout 800 ppm, less than about 750 ppm, or less than about 700 ppmgallic acid. In some embodiments, the stabilized oil may comprise about200 ppm to about 1,000 ppm gallic acid, about 250 ppm to about 950 ppmgallic acid, about 300 ppm to about 900 ppm gallic acid, about 350 ppmto about 850 ppm gallic acid, or about 400 ppm to about 800 ppm gallicacid. In some embodiments, the stabilized oil may comprise about 200 ppmto about 1,000 ppm gallic acid.

3-Hydroxytyrosol is a phenylethanoid compound with antioxidantproperties that may be found in olive leaf and olive oil.3-Hydroxytyrosol is commercially available from Cayman Chemical, AnnArbor, Mich., USA. In some embodiments, the stabilized oil may compriseat least about 200 ppm, at least about 250 ppm, at least about 300 ppm,at least about 350 ppm, at least about 400 ppm, at least about 450 ppm,or at least about 500 ppm 3-hydroxytyrosol. In some embodiments, thestabilized oil may comprise less than about 1,000 ppm, less than about950 ppm, less than about 900 ppm, less than about 850 ppm, less thanabout 800 ppm, less than about 750 ppm, or less than about 700 ppm3-hydroxytyrosol. In some embodiments, the stabilized oil may compriseabout 200 ppm to about 1,000 ppm EGC, about 250 ppm to about 950 ppm3-hydroxytyrosol, about 300 ppm to about 900 ppm 3-hydroxytyrosol, about350 ppm to about 850 ppm 3-hydroxytyrosol, or about 400 ppm to about 800ppm 3-hydroxytyrosol. In some embodiments, the stabilized oil maycomprise about 500 ppm to about 1,000 ppm 3-hydroxytyrosol.

Myricetin is a flavonoid with antioxidant properties found in a varietyof vegetables, fruits, nuts, berries, and teas. Myricetin iscommercially available from Cayman Chemical, Ann Arbor, Mich., USA. Insome embodiments, the stabilized oil may comprise at least about 200ppm, at least about 250 ppm, at least about 300 ppm, at least about 350ppm, at least about 400 ppm, at least about 450 ppm, or at least about500 ppm myricetin. In some embodiments, the stabilized oil may compriseless than about 1,000 ppm, less than about 950 ppm, less than about 900ppm, less than about 850 ppm, less than about 800 ppm, less than about750 ppm, or less than about 700 ppm myricetin. In some embodiments, thestabilized oil may comprise about 200 ppm to about 1,000 ppm myricetin,about 250 ppm to about 950 ppm myricetin, about 300 ppm to about 900 ppmmyricetin, about 350 ppm to about 850 ppm myricetin, or about 400 ppm toabout 800 ppm myricetin. In some embodiments, the stabilized oil maycomprise about 200 ppm to about 500 ppm myricetin.

Nepodin (2-acetyl-1,8-dihydroxy-3-methyl naphthalene, also commonlyknown as musizin) is an antioxidant that may be extracted from parts ofthe herb Rumex japonicus Houtt. Nepodin is commercially available fromALB Materials Inc., Henderson, Nev., USA. In some embodiments, thestabilized oil may comprise at least about 200 ppm, at least about 250ppm, at least about 300 ppm, at least about 350 ppm, at least about 400ppm, at least about 450 ppm, or at least about 500 ppm nepodin. In someembodiments, the stabilized oil may comprise less than about 1,000 ppm,less than about 950 ppm, less than about 900 ppm, less than about 850ppm, less than about 800 ppm, less than about 750 ppm, or less thanabout 700 ppm nepodin. In some embodiments, the stabilized oil maycomprise about 200 ppm to about 1,000 ppm nepodin, about 250 ppm toabout 950 ppm nepodin, about 300 ppm to about 900 ppm nepodin, about 350ppm to about 850 ppm nepodin, or about 400 ppm to about 800 ppm nepodin.In some embodiments, the stabilized oil may comprise about 200 ppm toabout 500 ppm nepodin.

Stabilized Oil

In one aspect, stabilized oils of the present disclosure include anantioxidant mixture comprising α-lipoic acid and at least one ofascorbic acid, ascorbyl palmitate, green tea extract, lecithin, androsemary extract.

In some embodiments, the antioxidant mixture may include α-lipoic acidand ascorbic acid. In some embodiments, the stabilized oil may includeabout 100 ppm to about 2,000 ppm α-lipoic acid and about 500 ppm toabout 2,500 ppm ascorbic acid.

In some embodiments, the antioxidant mixture may include α-lipoic acidand ascorbyl palmitate. In some embodiments, the stabilized oil mayinclude about 100 ppm to about 2,000 ppm α-lipoic acid and about 500 ppmto about 2,500 ppm ascorbyl palmitate.

In some embodiments, the antioxidant mixture may include α-lipoic acid,ascorbyl palmitate and green tea extract. In some embodiments, thestabilized oil may include about 100 ppm to about 2,000 ppm α-lipoicacid, about 500 ppm to about 2,500 ppm ascorbyl palmitate, and about 400ppm to about 1,600 ppm green tea extract.

In some embodiments, the antioxidant mixture may include α-lipoic acid,ascorbyl palmitate, green tea extract, and lecithin. In someembodiments, the stabilized oil may include about 100 ppm to about 2,000ppm α-lipoic acid, about 500 ppm to about 2,500 ppm ascorbyl palmitate,about 400 ppm to about 1,600 ppm green tea extract, and about 400 ppm toabout 1,600 ppm lecithin.

In some embodiments, the antioxidant mixture may include α-lipoic acidand rosemary extract. In some embodiments, the stabilized oil mayinclude about 100 ppm to about 2,000 ppm α-lipoic acid and about 725 ppmto about 6,000 ppm rosemary extracts.

In some embodiments, the antioxidant mixture may include α-lipoic acid,ascorbyl palmitate, and rosemary extract. In some embodiments, thestabilized oil may include about 100 ppm to about 2,000 ppm α-lipoicacid, about 500 ppm to about 2,500 ppm ascorbyl palmitate, and about 725ppm to about 6,000 ppm rosemary extracts.

In some embodiments, the antioxidant mixture may include α-lipoic acid,ascorbic acid, and rosemary extracts. In some embodiments, thestabilized oil may include about 100 ppm to about 2,000 ppm α-lipoicacid, about 500 ppm to about 2,500 ppm ascorbic acid, and about 725 ppmto about 6,000 ppm rosemary extracts.

In another aspect, stabilized oils of the present disclosure include anantioxidant mixture comprising α-lipoic acid and at least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodin.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and 1,2,4-benzenetriol.In some embodiments, the stabilized oil may include about 200 ppm toabout 1,000 ppm α-lipoic acid and about 200 ppm to about 1,000 ppm1,2,4-benzenetriol.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and carnosic acid. Insome embodiments, the stabilized oil may include about 1,000 ppmα-lipoic acid and about 1,000 ppm carnosic acid.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and dihydromyricetin. Insome embodiments, the stabilized oil may include about 500 ppm to about1,000 ppm α-lipoic acid and about 200 ppm to about 500 ppmdihydromyricctin.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and dihydrorobinetin. Insome embodiments, the stabilized oil may include about 500 ppm to about1,000 ppm α-lipoic acid and about 200 ppm to about 1,000 ppmdihydrorobinetin.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and epigallocatechin. Insome embodiments, the stabilized oil may include about 200 ppm to about1,000 ppm α-lipoic acid and about 200 ppm to about 500 ppmepigallocatechin.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and gallic acid. In someembodiments, the stabilized oil may include about 200 ppm to about 1,000ppm α-lipoic acid and about 200 ppm to about 1,000 ppm gallic acid.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and 3-hydroxytyrosol. Insome embodiments, the stabilized oil may include about 200 ppm to about1,000 ppm α-lipoic acid and about 200 ppm to about 1,000 ppm3-hydroxytyrosol.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and myricetin. In someembodiments, the stabilized oil may include about 500 ppm to about 1,000ppm α-lipoic acid and about 200 ppm to about 500 ppm myricetin.

In some embodiments, stabilized oils of the present disclosure includean antioxidant mixture comprising α-lipoic acid and nepodin. In someembodiments, the stabilized oil may include about 500 ppm to about 1,000ppm α-lipoic acid and about 200 ppm to about 500 ppm nepodin.

Stabilized oils of the present disclosure may have an OxidativeStability Index (“OSI”) at 110° C. (American Oil Chemists' Society testprotocol AOCS Cd 12b-92) of at least about 30 hours, at least about 32hours, at least about 34 hours, at least about 36 hours, at least about38 hours, at least about 40 hours, at least about 42 hours, at leastabout 44 hours, at least about 46 hours, at least about 48 hours, atleast about 50 hours, at least about 52 hours, at least about 54 hours,at least about 56 hours, at least about 58 hours, or at least about 60hours.

Stabilizing an Edible Oil

In another aspect, provided are methods of preparing a stabilized edibleoil. In some embodiments, the method includes providing an edible oiland adding to the edible oil an antioxidant composition, where theantioxidant composition comprises α-lipoic acid and least one ofascorbic acid, ascorbyl palmitate, green tea extract, lecithin, androsemary extract, or the antioxidant composition comprises α-lipoic acidand at least one of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin,dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol,myricetin, and nepodin. In some embodiments, the edible oil is a marineoil (e.g., a fish oil, an algal oil, a fungal oil). In some embodiments,the edible oil is a blend of a marine oil (e.g., a fish oil, an algaloil, a fungal oil) and a vegetable oil. In some embodiments, the edibleoil is a vegetable oil.

Methods of combining edible oils with other materials, such as, forexample, an antioxidant composition including α-lipoic acid and at leastone of ascorbic acid, ascorbyl palmitate, green tea extract, lecithin,and rosemary extract or at least one of 1,2,4-benzenetriol, carnosicacid, dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid,3-hydroxytyrosol, myricetin, and nepodin are known to those of ordinaryskill in the relevant arts.

In some embodiments, the antioxidant composition may be added to anedible oil at room temperature (e.g., about 23° C.). In someembodiments, the antioxidant composition may be added to a heated edibleoil, for example, an edible oil heat from about 23° C. to about 60° C.

In some embodiments, the antioxidant composition including α-lipoic acidand at least one of ascorbic acid, ascorbyl palmitate, green teaextract, lecithin, and rosemary extract or at least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodinmay be prepared as a mixture prior to addition to the edible oil. Insome embodiments, the mixture prepared prior to addition to the edibleoil may include an organic solvent (e.g., acetone).

In some embodiments, the α-lipoic acid and at least one of ascorbicacid, ascorbyl palmitate, green tea extract, lecithin, and rosemaryextract or at least one of 1,2,4-benzenetriol, carnosic acid,dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid,3-hydroxytyrosol, myricetin, and nepodin may be added sequentially tothe edible oil, e.g., the α-lipoic acid may be added first to the edibleoil, followed by the addition of at least one of ascorbic acid, ascorbylpalmitate, green tea extract, lecithin, and rosemary extract or at leastone of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin,dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol,myricetin, and nepodin, or at least one of ascorbic acid, ascorbylpalmitate, green tea extract, lecithin, and rosemary extract or at leastone of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin,dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol,myricetin and nepodin may be added first to the edible oil, followed bythe addition of α-lipoic acid. In some embodiments, the α-lipoic acidmay be added during the addition of at least one of ascorbic acid,ascorbyl palmitate, green tea extract, lecithin, and rosemary extract orat least one of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin,dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol,myricetin, and nepodin to the edible oil.

The concentrations and types of α-lipoic acid, ascorbic acid, ascorbylpalmitate, green tea extract, lecithin, rosemary extract,1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodinwhich can be added to an edible oil to yield a stabilized oil are thosedescribed above for the stabilized oil.

The addition of α-lipoic acid and at least one of ascorbic acid,ascorbyl palmitate, green tea extract, lecithin, and rosemary extract orat least one of 1,2,4-benzenetriol, carnosic acid, dihydromyricetin,dihydrorobinetin, epigallocatechin, gallic acid, 3-hydroxytyrosol,myricetin, and nepodin to an edible oil provides an oil which showssurprisingly enhanced stabilization in OSI testing. This effect can bebest examined when the stabilized oil of the present disclosure iscompared to the same edible oil without the addition of α-lipoic acidand at least one of ascorbic acid, ascorbyl palmitate, green teaextract, lecithin, and rosemary extracts or at least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodinafter both are heated for extended periods of time. In the subsequentExample section, this benefit is exemplified in Examples 1 and 2, whichshow the difference in OSI value of an edible oil without added α-lipoicacid and at least one of ascorbic acid, ascorbyl palmitate, green teaextract, lecithin, and rosemary extract or at least one of1,2,4-benzenetriol, carnosic acid, dihydromyricetin, dihydrorobinetin,epigallocatechin, gallic acid, 3-hydroxytyrosol, myricetin, and nepodinand the OSI value of an edible oil to which α-lipoic acid and at leastone of ascorbic acid, ascorbyl palmitate, green tea extract, lecithin,and rosemary extract or at least one of 1,2,4-benzenetriol, carnosicacid, dihydromyricetin, dihydrorobinetin, epigallocatechin, gallic acid,3-hydroxytyrosol, myricetin, and nepodin have been added before heating.

EXAMPLES

Aspects of certain embodiments in accordance with aspects of thedisclosure are illustrated in the following Examples. The materials andmethods described in these Examples are illustrative and not intended tobe limiting.

Experimental Procedures

Oxidative Stability Index (“OSI”): The OSI measurements were carried outin accordance with AOCS Cd 12b-92 at 110° C. with a 743 RANCIMATanalyzer (Metrohm AG, Herisau, Switzerland) generally in accordance withAmerican Oil Chemists' Society test protocol AOCS Cd 12b-92, except thatthe sample size of the oil is 3.0 g.

Fatty acid profile (wt %) determination: In accordance with American OilChemist's Society Official Method AOCS Ce Ii-07, the oil is treated toconvert acylglycerols to fatty acid methyl esters (“FAME”) and vials ofthe FAME are placed in a gas chromatograph for analysis in accordancewith American Oil Chemist's Society Official Method AOCS Ce Ii-07. Thismodified chromatography employs an Agilent 7890A gas chromatograph(Agilent Technologies, Santa Clara, Calif.) equipped with a fused silicacapillary column (30 m×0.25 mm and 0.25 μm film thickness) packed with apolyethylene glycol based DB-WAX for liquid phase separation (J&WScientific, Folsom, Calif.). Hydrogen (H2) is used as the carrier gas ata flow rate of 1.2 mL/min and the column initial temperature is 170° C.,ramp 1° C./min, final temperature is 225° C.

Schaal Oven Test (AOCS Cg 5-97): The oil is placed in amber glassbottles and the bottles are stored, open to ambient air, in anelectrically heated convection oven held at 60° C. The oil isperiodically assessed, e.g., by measuring peroxide values and/orconducting sensory testing. This method is commonly referred to as the“Schaal Oven” method and is widely used as an accelerated aging test ofshelf stability for oil substrates.

Peroxide Value: Conducted in accordance with American Oil Chemist'sSociety Official Method AOCS Cd 8b-90.

Materials

α-Lipoic acid (Lalilab Incorporated, Durham, N.C., USA, and AnMarInternational Ltd., Bridgeport, Conn., USA), ascorbic acid (Alfa Aesar,Ward fill, Massachusetts, USA), ascorbyl palmitate (Alfa Aesar, WardHill, Mass., USA), 1,2,4-benzenetriol (Sigma-Aldrich Corp., St. Louis,Mo., USA), carnosic acid (ChromaDex, Inc., Irvine, Calif., USA),dihydromyricetin (Sigma-Aldrich Corp., St. Louis, Mo., USA),dihydrorobinetin (Indofine Chemical Co., Inc., Hillsborough Township,N.J., USA), epigallocatechin (Indofine Chemical Co., Inc., HillsboroughTownship, N.J., USA), DANISCO GUARDIAN green tea extract (E. I. du Pontde Nemours and Company, Wilmington, Del., USA), gallic acid(Sigma-Aldrich Corp., St. Louis, Mo., USA), 3-hydroxytyrosol (CaymanChemical, Ann Arbor, Mich., USA), lecithin (Connoils LLC, Waukesha,Wis., USA), myricetin (Cayman Chemical, Ann Arbor, Mich., USA), nepodin(ALB Materials Inc., Henderson, Nev., USA), HONSEA 60 rosemary extract(Honsea Sunshine Biotech Co. Ltd., Guangzhou, China), OXY'BLOCK D 150821(Naturex SA, Avignon, France), CLEAR VALLEY 80-brand canola oil (“CV80”)(Cargill, Incorporated, Wayzata, Minn., USA), and MEG3 Sardine Anchovy29% K Food Oil fish oil (Ocean Nutrition Canada Limited, Dartmouth, NovaScotia, Canada).

Example 1: OSI of Edible Oils Including Antioxidant Compositions

A blend of CV80 and fish oil (“CV80/fish”) is prepared by combining CV80(800.00 g) and MEG3 Sardine Anchovy fish oil (200.02 g). The CV80/fishoil is combined with antioxidant to provide oil samples havingconcentrations as shown in Table 1. OSI testing was performed on each ofthe samples as set forth above. The results of the OSI tests are setforth in Table 1.

Antioxidant synergy, additive effects, or antagonistic effects arecalculated using the following Formula 1 (de Guzman et al., J Am OilChem Soc, 2009, 86 (5):459-467):

(RT _(Mix) −RT _(Contol))−[(RT _(Additive1) −RT _(Control))+(RT_(Additive2) −RT _(Control))]=Antioxidant Effect

where RT=RANCIMAT Time.Synergy of antioxidant mixtures in the oil is demonstrated byAntioxidant Effect values of >0.8, an additive effect is demonstrated byAntioxidant Effect values of ±0.8, and an antagonistic effect of theantioxidant mixtures is demonstrated by Antioxidant Effect values of<−0.8.

TABLE 1 OSI of CV80/Fish Oil Blend Including Antioxidants Antiox-Antiox- Added idant idant Antioxidant Effect Effect AntioxidantConcentration OSI Calcu- Relation- Composition in Oil (ppm) (hours)lation ship None None 9.5 NA NA α-Lipoic acid 200 10.3 NA NA (Lalilab)α-Lipoic acid 500 11.2 NA NA (Lalilab) α-Lipoic acid 700 12.2 NA NA(Lalilab) α-Lipoic acid 1000 13.5 NA NA (Lalilab) α-Lipoic acid 100013.6 NA NA (AnMar) Ascorbic acid 200 9.7 NA NA Ascorbic acid 500 10.56NA NA Ascorbic acid 700 10.42 NA NA Ascorbic acid 1000 12.84 NA NAAscorbyl palmitate 200 13.23 NA NA Ascorbyl palmitate 500 17.44 NA NAAscorbyl palmitate 700 19.1 NA NA Ascorbyl palmitate 1000 20.67 NA NAGreen tea extract 500 13.37 NA NA Green tea extract 1000 14.06 NA NAGreen tea extract 2000 16.82 NA NA Green tea extract 3000 17.84 NA NALecithin 500 10.87 NA NA Lecithin 1000 11.48 NA NA Lecithin 2000 13.1 NANA Lecithin 3000 16.99 NA NA Oxyblock D150821 3000 31.1 NA NA NATUREXRosemary extract 3000 22.04 NA NA (Honsea 60) α-Lipoic acid/ 1000/100037.1 12.43 Synergy Ascorbyl palmitate α-Lipoic acid/ 1000/1000/1000 4114.35 Synergy Ascorbyl palmitate/ Lecithin α-Lipoic acid/ 1000/1000/100039 9.77 Synergy Ascorbyl palmitate/ Green tea extract α-Lipoic acid/1000/1000/1000/ 46 14.79 Synergy Ascorbyl palmitate/ 707 Green teaextract/Lecithin α-Lipoic acid/ 1000/3000 44.5 9.4 Synergy NATUREXα-Lipoic acid/ 1000/1000/3000 46.98 0.71 Additive Ascorbyl palmitate/NATUREX Rosemary 1000/1000/1000 34.8 extract/Ascorbyl palmitate/a-lipoicacid Rosemary 3000/1000/200 33.93 −0.08 Additive extract/Ascorbylpalmitate/α-Lipoic acid Rosemary 3000/1000/500 32.59 −2.32 Antagonisticextract/Ascorbyl palmitate/α-Lipoic acid Rosemary 3000/1000/1000 35.37−1.84 Antagonistic extract/Ascorbyl palmitate/α-Lipoic acid Rosemary3000/2000/1000 41.46 extract/Ascorbyl palmitate/α-Lipoic acid

As shown in Table 1, an edible oil comprising α-lipoic acid incombination with at least a second antioxidant. i.e., ascorbic acid,ascorbyl palmitate, green tea extract, lecithin, or rosemary extract,exhibits surprisingly high stability at certain concentrations ofα-lipoic acid and the second antioxidant(s), i.e., where the AntioxidantEffect values are >0.8.

Example 2: OSI of Edible Oils Including Antioxidant Compositions

A blend of CV80 and fish oil (“CV80/fish”) is prepared by combining CV80(800.00 g) and MEG3 Sardine Anchovy fish oil (200.02 g). An aliquot ofthe CV80/fish oil blend (15.00 g) is combined with antioxidant dissolvedin acetone (0.5 mL) to provide oil samples having antioxidantconcentrations as shown in Table 2. Acetone (0.5 mL) without addedantioxidant is added to the control aliquot. The oil samples are placedin a fume hood under a nitrogen stream for about tour hours to removeall traces of the acetone before OSI testing. OSI testing is performedon each of the samples as set forth above. The results of the OSI testsare set forth in Table 2.

Antioxidant synergy, additive effects, or antagonistic effects arecalculated using Formula 1 as shown in Example 1. Synergy of antioxidantmixtures in the oil is demonstrated by Antioxidant Effect valuesof >0.8, an additive effect is demonstrated by Antioxidant Effect valuesof ±0.8, and an antagonistic effect of the antioxidant mixtures isdemonstrated by Antioxidant Effect values of <−0.8.

TABLE 2 OSI of CV80/Fish Oil Blend Including Antioxidants Added Antiox-Anti- idant Ef- Antiox- oxidant fect Cal- idant Concen- culation EffectAntioxidant tration in OSI Using Relation- Composition Oil (ppm) (hours)Formula 1 ship None None 10.22 NA NA α-Lipoic acid 200 11.24 NA NAα-Lipoic acid 500 12.11 NA NA α-Lipoic acid 1000 14.31 NA NA1,2,4-Benzenetriol 200 28.54 NA NA 1,2,4-Benzenetriol 500 43.23 NA NA1,2,4-Benzenetriol 1000 53.00 NA NA Carnosic acid 200 14.36 NA NACarnosic acid 500 15.25 NA NA Carnosic acid 1000 18.22 NA NADihydromyricetin 200 14.03 NA NA Dihydromyricetin 500 20.32 NA NADihydromyricetin 1000 25.56 NA NA Dihydrorobinetin 200 15.64 NA NADihydrorobinetin 500 22.47 NA NA Dihydrorobinetin 1000 27.24 NA NAEpigailocatechin 200 13.42 NA NA Epigallocatechin 500 17.49 NA NAEpigallocatechin 1000 25.74 NA NA Gallic acid 200 14.74 NA NA Gallicacid 500 21.53 NA NA Gallic acid 10000 28.34 NA NA 3-Hydroxytyrosol 20013.42 NA NA 3-Hydroxytyrosol 500 16.14 NA NA 3-HydroxytyrosoI 1000 19.19NA NA Myricetin 200 13.17 NA NA Myricetin 500 17.87 NA NA Myricetin 100023.34 NA NA Nepodin 200 21.18 NA NA Nepodin 500 35.29 NA NA Nepodin 100046.78 NA NA α-Lipoic acid/1,2,4- 200/200 31.35 1.79 Synergy benzenetriolα-Lipoic acid/1,2,4- 200/500 46.73 2.48 Synergy benzenetriol α-Lipoicacid/1,2,4-  200/1000 53.84 −0.18 Additive Benzenetriol α-Lipoicacid/1,2,4- 500/200 35.92 5.49 Synergy Benzenetriol α-Lipoic acid/1,2,4-500/500 48.51 3.39 Synergy Benzenetriol α-Lipoic acid/1,2,4-  500/100059.60 4.71 Synergy Benzenetriol α-Lipoic acid/1,2,4- 1000/200  41.979.34 Synergy Benzenetriol α-Lipoic acid/1,2,4- 1000/500  52.30 4.98Synergy Benzenetriol α-Lipoic acid/1,2,4- 1000/1000 61.63 4.54 SynergyBenzenetriol α-Lipoic acid/Carnosic 200/200 14.72 −0.66 Additive acidα-Lipoic acid/Carnosic 200/500 16.39 0.12 Additive acid α-Lipoicacid/Carnosic  200/1000 17.34 −1.90 Antagonistic acid α-Lipoicacid/Carnosic 500/200 15.18 −1.07 Antagonistic acid α-Lipoicacid/Carnosic 500/500 17.56 0.42 Additive acid α-Lipoic acid/Carnosic 500/1000 19.92 −0.19 Additive acid α-Lipoic acid/Carnosic 1000/200 16.30 −2.15 Antagonistic acid α-Lipoic acid/Carnosic 1000/500  19.950.61 Additive acid α-Lipoic acid/Carnosic 1000/1000 25.05 2.74 Synergyacid α-Lipoic acid/ 200/200 15.40 0.35 Additive Dihydromyricetinα-Lipoic acid/ 200/500 20.02 −1.32 Antagonistic Dihydromyricetinα-Lipoic acid/  200/1000 22.88 −3.70 Antagonistic Dihydromyricetinα-Lipoic acid/ 500/200 17.27 1.35 Synergy Dihydromyricetin α-Lipoicacid/ 500/500 22.59 0.38 Additive Dihydromyricetin α-Lipoic acid/ 500/1000 24.23 −3.22 Antagonistic Dihydromyricetin α-Lipoic acid/1000/200  19.94 1.82 Synergy Dihydromyricetin α-Lipoic acid/ 1000/500 25.86 1.45 Synergy Dihydromyricetin α-Lipoic acid/ 1000/1000 30.38 0.73Additive Dihydromyricetin α-Lipoic acid/ 200/200 13.29 −3.37Antagonistic Dihydrorobinetin α-Lipoic acid/ 200/500 22.56 −0.93Antagonistic Dihydrorobinetin α-Lipoic acid/  200/1000 26.81 −1.45Antagonistic Dihydrorobinetin α-Lipoic acid/ 500/200 18.47 4.75 SynergyDihydrorobinetin α-Lipoic acid/ 500/500 27.58 3.22 SynergyDihydrorobinetin α-Lipoic acid/  500/1000 30.81 1.68 SynergyDihydrorobinetin α-Lipoic acid/ 1000/200  21.07 1.34 SynergyDihydrorobinetin α-Lipoic acid/ 1000/500  30.67 4.11 SynergyDihydrorobinetin α-Lipoic acid/ 1000/1000 33.90 2.57 SynergyDihydrorobinetin α-Lipoic acid/ 200/200 16.82 2.38 SynergyEpigallocatechin α-Lipoic acid/ 200/500 22.74 4.23 SynergyEpigallocatechin α-Lipoic acid/  200/1000 26.25 −0.51 AdditiveEpigallocatechin α-Lipoic acid/ 500/200 18.56 3.25 SynergyEpigallocatechin α-Lipoic acid/ 500/500 25.24 5.86 SynergyEpigallocatechin α-Lipoic acid/  500/1000 28.17 0.54 AdditiveEpigallocatechin α-Lipoic acid/ 1000/200  21.50 3.99 SynergyEpigallocatechin α-Lipoic acid/ 1000/500  25.64 4.06 SynergyEpigallocatechin α-Lipoic acid/ 1000/1000 29.30 −0.53 AdditiveEpigallocatechin α-Lipoic acid/ 200/200 17.05 1.29 Synergy Gallic acidα-Lipoic acid/ 200/500 24.43 1.88 Synergy Gallic acid α-Lipoic acid/ 200/1000 30.81 1.45 Synergy Gallic acid α-Lipoic acid/ 500/200 19.212.58 Synergy Gallic acid α-Lipoic acid/ 500/500 29.26 5.84 SynergyGallic acid α-Lipoic acid/  500/1000 33.43 3.20 Synergy Gallic acidα-Lipoic acid/ 1000/200  30.81 11.98 Synergy Gallic acid α-Lipoic acid/1000/500  33.54 7.92 Synergy Gallic acid α-Lipoic acid/ 1000/1000 36.564.13 Synergy Gallic acid α-Lipoic acid/3- 500/200 14.31 −1.00Antagonistic Hydroxytyrosol α-Lipoic acid/3- 500/500 18.28 0.25 AdditiveHydroxytyrosol α-Lipoic acid/3-  500/1000 21.21 0.13 AdditiveHydroxytyrosol α-Lipoic acid/3- 1000/200  15.72 −1.79 AntagonisticHydroxytyrosol α-Lipoic acid/3- 1000/500  19.98 −0.25 AdditiveHydroxytyrosol α-Lipoic acid/3- 1000/1000 22.85 −0.43 AdditiveHydroxytyrosol α-Lipoic acid/Myricetin 200/200 14.61 0.42 Additiveα-Lipoic acid/Myricetin 200/500 17.98 −0.91 Antagonistic α-Lipoicacid/Myricetin  200/1000 24.20 −0.16 Additive α-Lipoic acid/Myricetin500/200 16.27 1.21 Synergy α-Lipoic acid/Myricetin 500/500 23.26 3.50Synergy α-Lipoic acid/Myricetin  500/1000 25.58 0.35 Additive α-Lipoicacid/Myricetin 1000/200  18.98 1.72 Synergy α-Lipoic acid/Myricetin1000/500  24.37 2.41 Synergy α-Lipoic acid/Myricetin 1000/1000 28.040.61 Additive α-Lipoic acid/Nepodin 200/200 20.93 −1.27 Antagonisticα-Lipoic acid/Nepodin 200/500 36.76 0.45 Additive α-Lipoic acid/Nepodin 200/1000 47.14 −0.66 Additive α-Lipoic acid/Nepodin 500/200 25.10 2.03Synergy α-Lipoic acid/Nepodin 500/500 39.59 2.41 Synergy α-Lipoicacid/Nepodin  500/1000 48.85 0.18 Additive α-Lipoic acid/Nepodin1000/200  29.00 3.73 Synergy α-Lipoic acid/Nepodin 1000/500  42.28 2.90Synergy α-Lipoic acid/Nepodin 1000/1000 50.55 −0.32 Additive

As shown in Table 2, an edible oil comprising α-lipoic acid incombination with a second antioxidant, i.e., 1,2,4-benzenetriol,carnosic acid, dihydromyricetin, dihydrorobinetin, epigallocatechin,gallic acid, 3-hydroxytyrosol, myricetin, or nepodin exhibitssurprisingly high stability at certain concentrations of α-lipoic acidand the second antioxidant, i.e., where the Antioxidant Effect valuesare >0.8.

1-8. (canceled)
 9. A method for preparing a stabilized oil, the methodcomprising: providing an edible oil; and adding an antioxidantcomposition to the edible oil to provide a stabilized oil; wherein theantioxidant composition consists of about 800 ppm to about 2.000 ppmα-lipoic acid based on total weight of the stabilized oil and one ormore selected from the group consisting of: about 500 ppm to about 2.500ppm of ascorbyl palmitate based on total weight of the stabilized oil;about 400 ppm to about 1.600 ppm of green tea extract based on totalweight of the stabilized oil; about 725 ppm to about 6.000 ppm ofrosemary extract based on total weight of the stabilized oil; and about400 ppm to about 1.600 ppm of lecithin based on total weight of thestabilized oil.
 10. The method of claim 9, wherein the edible oilcomprises a soybean oil, a palm oil, a canola oil, corn oil, an oliveoil, a peanut oil, a sunflower oil, a sesame oil, a safflower oil, amarine oil, or mixtures thereof.
 11. The method of claim 10, wherein theedible oil comprises a polyunsaturated fat selected from the groupconsisting of ALA, EPA, and DHA. 12-16. (canceled)
 17. The method ofclaim 9, wherein the stabilized oil has an Oxidative Stability Index at110° C. of at least 30 hours. 18-44. (canceled)
 45. The method of claim9, wherein the antioxidant composition consists of about 800 ppm toabout 2,000 ppm of α-lipoic acid and about 500 ppm to about 2,500 ppm ofascorbyl palmitate, based on total weight of the stabilized oil.
 46. Themethod of claim 9, wherein the antioxidant composition consists of about800 ppm to about 2,000 ppm of α-lipoic acid, about 500 ppm to about1,600 ppm of lecithin, and about 500 ppm to about 2,500 ppm of ascorbylpalmitate, based on total weight of the stabilized oil.
 47. The methodof claim 9, wherein the antioxidant composition consists of about 800ppm to about 2,000 ppm of α-lipoic acid, about 500 ppm to about 1,600ppm of lecithin, and about 400 ppm to about 1,600 ppm of green teaextract, based on total weight of the stabilized oil.
 48. The method ofclaim 9, wherein the antioxidant composition consists of about 800 ppmto about 2,000 ppm of α-lipoic acid, about 500 ppm to about 2,500 ppm ofascorbyl palmitate, and about 400 ppm to about 1,600 ppm of green teaextract, based on total weight of the stabilized oil.
 49. The method ofclaim 9, wherein the antioxidant composition consists of about 800 ppmto about 2,000 ppm of α-lipoic acid and about 725 ppm to about 6,000 ppmof rosemary extract, based on total weight of the stabilized oil.